Ver o código fonte de "MediaWiki:Gadget-UTCLiveClock.js"

// Warning! Global gadget file!
( function ( mw, $ ) {

var $target;

function showTime( $target ) {
	var dateNode = UTCLiveClockConfig.node;
	if ( !dateNode ) {
		return;
	}

	var now = new Date();
	var hh = now.getUTCHours();
	var mm = now.getUTCMinutes();
	var ss = now.getUTCSeconds();
	if ( $target === undefined ) {
		$target = $( dateNode ).find( 'a:first' );
	}
	var time = ( hh < 10 ? '0' + hh : hh ) + ':' + ( mm < 10 ? '0' + mm : mm ) + ':' + ( ss < 10 ? '0' + ss : ss );
	$target.text( time );

        var ms = now.getUTCMilliseconds();

	setTimeout( function (){
		showTime( $target );	
	}, 1100 - ms );
}

function liveClock() {
	appendCSS( '#utcdate a { font-weight:bolder; font-size:120%; }' );

	if ( window.UTCLiveClockConfig === undefined ) {
		window.UTCLiveClockConfig = {};
	}
	var portletId = UTCLiveClockConfig.portletId || 'p-personal';
	var nextNode = UTCLiveClockConfig.nextNodeId ? document.getElementById( UTCLiveClockConfig.nextNodeId ) : undefined;
	UTCLiveClockConfig.node = mw.util.addPortletLink(
		portletId,
		mw.config.get( 'wgScript' ) + '?title=' + encodeURIComponent( mw.config.get( 'wgPageName' ) ) + '&action=purge',
		'',
		'utcdate',
		null,
		null,
		nextNode
	);
	if ( !UTCLiveClockConfig.node ) {
		return;
	}

	showTime();
}
$( document ).ready( liveClock );

} )( mediaWiki, jQuery );